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What do you mean by the term Hearing AID

What do you mean by the term Hearing AID?

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The hearing aid is an electronic battery device which amplifies and change sound to permit for enhanced communication.

Hearing aid receives sound via a tiny microphone which then transforms the sound waves to electrical signal.  The amplifier raises the loudness of signals and then sends the sound to the ear via a speaker in an earpiece that fits into an outer ear canal. The electrical signals are transformed back to the sound waves.

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